packer-cn/builder/amazon/chroot/step_copy_files.go

108 lines
2.2 KiB
Go

package chroot
import (
"fmt"
"github.com/mitchellh/multistep"
"github.com/mitchellh/packer/packer"
"io"
"log"
"os"
"path/filepath"
)
// StepCopyFiles copies some files from the host into the chroot environment.
//
// Produces:
// copy_files_cleanup CleanupFunc - A function to clean up the copied files
// early.
type StepCopyFiles struct {
files []string
}
func (s *StepCopyFiles) Run(state map[string]interface{}) multistep.StepAction {
config := state["config"].(*Config)
mountPath := state["mount_path"].(string)
ui := state["ui"].(packer.Ui)
s.files = make([]string, 0, len(config.CopyFiles))
if len(config.CopyFiles) > 0 {
ui.Say("Copying files from host to chroot...")
for _, path := range config.CopyFiles {
ui.Message(path)
chrootPath := filepath.Join(mountPath, path)
log.Printf("Copying '%s' to '%s'", path, chrootPath)
if err := s.copySingle(chrootPath, path); err != nil {
err := fmt.Errorf("Error copying file: %s", err)
state["error"] = err
ui.Error(err.Error())
return multistep.ActionHalt
}
s.files = append(s.files, chrootPath)
}
}
state["copy_files_cleanup"] = s
return multistep.ActionContinue
}
func (s *StepCopyFiles) Cleanup(state map[string]interface{}) {
ui := state["ui"].(packer.Ui)
if err := s.CleanupFunc(state); err != nil {
ui.Error(err.Error())
}
}
func (s *StepCopyFiles) CleanupFunc(map[string]interface{}) error {
if s.files != nil {
for _, file := range s.files {
log.Printf("Removing: %s", file)
if err := os.Remove(file); err != nil {
return err
}
}
}
s.files = nil
return nil
}
func (s *StepCopyFiles) copySingle(dst, src string) error {
// Stat the src file so we can copy the mode later
srcInfo, err := os.Stat(src)
if err != nil {
return err
}
// Remove any existing destination file
if err := os.Remove(dst); err != nil {
return err
}
// Copy the files
srcF, err := os.Open(src)
if err != nil {
return err
}
defer srcF.Close()
dstF, err := os.Create(dst)
if err != nil {
return err
}
defer dstF.Close()
if _, err := io.Copy(dstF, srcF); err != nil {
return err
}
dstF.Close()
// Match the mode
if err := os.Chmod(dst, srcInfo.Mode()); err != nil {
return err
}
return nil
}